DOM Level 0: what was implemented for JavaScript in Netscape 3/IE3
DOM Level 1, a W3C Standard
DOM Level 2, a W3C Standard
Added namespace supoprt
DOM Level 3: Several Working Drafts:
Document Object Model (DOM) Level 3 Core Specification (Proposed Recommendation February 5, 2004)
Document Object Model (DOM) Level 3 Load and Save Specification Version 1.0 (Proposed Recommendation February 5, 2004)
Document Object Model (DOM) Level 3 Validation Specification Version 1.0 (Recommendation, January 27, 2004)
Document Object Model (DOM) Level 3 XPath Specification (Note, February 26, 2004)
Document Object Model (DOM) Level 3 Events Specification Version 1.0 (Note, December 7, 2003)
Document Object Model (DOM) Level 3 Views and Formatting Specification (Note, February 26, 2004)
Document Object Model (DOM) Requirements (Note, February 26, 2004)